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...e number of [[integer]]s.<ref>{{harvnb|Maddox|2002|loc=pp. 113–117}}</ref> In this usage, infinity is a mathematical concept, and infinite [[mathematical ...|s2cid=13475845}}</ref> for solving a long-standing problem that is stated in terms of [[elementary arithmetic]]. ...

...23b" /><ref name=":35" /> They also maintain a high level of participation in the labor force.<ref name=":37" /> ...ned with liberalism.<ref name=":25" /><ref name=":34" /><ref name=":27" /> In fact, they frequently identify as politically independent,<ref name=":27" / ...

...ty of Kadesh.jpg|thumb|Tablet of one of the earliest recorded [[treaties]] in history, [[Egyptian-Hittite peace treaty|Treaty of Kadesh]], at the [[Istan ...ital is being spent. This practice has existed in some form for centuries; in ancient [[Egypt]], for example, when grain was often used as currency, loca ...

[[File:Dürer Melancholia I.jpg|thumb|250px|Mathematics in art: [[Albrecht Dürer]]'s copper plate engraving ''[[Melencolia I]]'', 1514 [[File:Paolo uccello, studio di vaso in prospettiva 02.jpg|thumb|250px|[[Wire-frame model|Wireframe drawing]]<ref n ...

...47.jpg|alt=|thumb|[[Leonardo da Vinci|Leonardo]] wrote aerodynamic studies in a notebook eventually titled <nowiki>''</nowiki>[[Codex on the Flight of Bi ...reospecific Polymerization: A revolution in polymer synthesis has occurred in the last decade. |journal=Science |date=14 August 1964 |volume=145 |issue=3 ...

...[https://books.google.com/books?id=whc4AAAAMAAJ&pg=PT5 digitized version] in [[Google Books]].</ref>]] ...radiation]], radioactive substances such as [[radon]] and [[radium]] found in the environment, and the potential health hazards of non-ionizing radiation ...